lol so SO many bad things would come of using that...
Ask yourself these VERY important questions if you decide to use that (very uncool looking in my opinion) Rocket booster backpack...
1. How will you stabalize flight?
2. How will you NOT fry the lower part of your body from the exhaust wash?
3. How will you turn Vertical lift into Horizontal flight?
4. How will you stabalize said lift and flight?
5. Most important of all, how will you not turn into an impact crater upon landing, after either your fuel runs out, or you turn into an up-ended rocket when trying to move from horizontal lift to vertical flight, and end up blasting head first back to earth?
In other words... SAFETY should be a priority before cost... actually, common sense should be THE priority... but we have already seen how well you receive that...